ダウンロードとインストール
MySQLからレポジトリをさがす
今回は、CentOS7なので、el7を使う。
console
# yum install http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
# cat /etc/yum.repos.d/mysql-community.repo
（適当なレポジトリ名を探す）
# yum list --enablerepo=mysql56-community | grep mysql
（mysql-community系だけ抜粋）
mysql-community-release.noarch el7-5 @/mysql-community-release-el7-5.noarch
mysql-community-bench.x86_64 5.6.20-4.el7 mysql56-community
mysql-community-client.i686 5.6.20-4.el7 mysql56-community
mysql-community-client.x86_64 5.6.20-4.el7 mysql56-community
mysql-community-common.i686 5.6.20-4.el7 mysql56-community
mysql-community-common.x86_64 5.6.20-4.el7 mysql56-community
mysql-community-devel.i686 5.6.20-4.el7 mysql56-community
mysql-community-devel.x86_64 5.6.20-4.el7 mysql56-community
mysql-community-embedded.i686 5.6.20-4.el7 mysql56-community
mysql-community-embedded.x86_64 5.6.20-4.el7 mysql56-community
mysql-community-embedded-devel.i686 5.6.20-4.el7 mysql56-community
mysql-community-embedded-devel.x86_64 5.6.20-4.el7 mysql56-community
mysql-community-libs.i686 5.6.20-4.el7 mysql56-community
mysql-community-libs.x86_64 5.6.20-4.el7 mysql56-community
mysql-community-server.x86_64 5.6.20-4.el7 mysql56-community
mysql-community-test.x86_64 5.6.20-4.el7 mysql56-community
mysql-connector-odbc.x86_64 5.3.4-1.el7 mysql-connectors-community
mysql-connector-python.noarch 1.2.2-1.el7 mysql-connectors-community
mysql-utilities.noarch 1.4.4-1.el7 mysql-tools-community
mysql-utilities-extra.noarch 1.4.4-1.el7 mysql-tools-community
（32bitならi686系を、64bitならx86_64系を）
# yum install --enablerepo=mysql56-community mysql-community-client.x86_64 mysql-community-devel.x86_64 mysql-community-server.x86_64
Dependencies Resolved
================================================================================================================================
Package Arch Version Repository Size
================================================================================================================================
Installing:
mysql-community-client x86_64 5.6.20-4.el7 mysql56-community 19 M
mysql-community-devel x86_64 5.6.20-4.el7 mysql56-community 3.4 M
mysql-community-libs x86_64 5.6.20-4.el7 mysql56-community 2.0 M
replacing mariadb-libs.x86_64 1:5.5.37-1.el7_0
mysql-community-server x86_64 5.6.20-4.el7 mysql56-community 57 M
Installing for dependencies:
mysql-community-common x86_64 5.6.20-4.el7 mysql56-community 248 k
perl-Compress-Raw-Bzip2 x86_64 2.061-3.el7 base 32 k
perl-Compress-Raw-Zlib x86_64 1:2.061-4.el7 base 57 k
perl-DBI x86_64 1.627-4.el7 base 802 k
perl-IO-Compress noarch 2.061-2.el7 base 260 k
perl-Net-Daemon noarch 0.48-5.el7 base 51 k
perl-PlRPC noarch 0.2020-14.el7 base 36 k
Transaction Summary
================================================================================================================================
Install 4 Packages (+7 Dependent packages)
Total download size: 83 M
Is this ok [y/d/N]:
Installed:
mysql-community-client.x86_64 0:5.6.20-4.el7 mysql-community-devel.x86_64 0:5.6.20-4.el7
mysql-community-libs.x86_64 0:5.6.20-4.el7 mysql-community-server.x86_64 0:5.6.20-4.el7
Dependency Installed:
mysql-community-common.x86_64 0:5.6.20-4.el7 perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7
perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7 perl-DBI.x86_64 0:1.627-4.el7
perl-IO-Compress.noarch 0:2.061-2.el7 perl-Net-Daemon.noarch 0:0.48-5.el7
perl-PlRPC.noarch 0:0.2020-14.el7
Replaced:
mariadb-libs.x86_64 1:5.5.37-1.el7_0
Complete!
# mysql --version
mysql Ver 14.14 Distrib 5.6.20, for Linux (x86_64) using EditLine wrapper
CentOS7から、標準でMariaDBがインストールできます。
ので、MySQLをインストールしようとすると競合するので注意。
参考：ubuntuにMariaDBをインストールしてみた
あとは、このへんみたりして、初期設定をしてください。
2015-09-18 追記
@ma_me さんの記事をリンクしました
Centos7でmysql のインストールとインストール時のエラー対処